package com.meizi.mall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.meizi.mall.common.to.es.SkuEsModel;
import com.meizi.mall.search.config.ElasticsearchConfig;
import com.meizi.mall.search.constant.EsConstant;
import com.meizi.mall.search.service.SearchService;
import com.meizi.mall.search.vo.SearchParam;
import com.meizi.mall.search.vo.SearchResult;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author meizi
 * @email enjoymeizi@gmail.com
 * @date 2021/1/21 17:18
 */
@Service
public class SearchServiceImpl implements SearchService {
    @Autowired
    private RestHighLevelClient esClient;
    /**
     * bool 用来组合多查询
     * must 用来多个匹配，参与评分
     * filter  不参与评分
     *
     * --term 精确匹配
     * @param searchParam
     * @return
     */
    @Override
    public SearchResult searchInfo(SearchParam searchParam) {
        SearchResult searchResult ;
        SearchRequest searchRequest = buildSearchRequest(searchParam);
        SearchResponse searchResponse = null;
        try {
            searchResponse = esClient.search(searchRequest, ElasticsearchConfig.COMMON_OPTIONS);
        } catch (IOException e) {
            e.printStackTrace();
        }
        searchResult =  buildSearchResponse(searchResponse,searchParam);
        return searchResult;
    }

    private SearchResult buildSearchResponse(SearchResponse response,SearchParam param) {

        SearchResult result = new SearchResult();
        SearchHits hits = response.getHits();
        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel skuEsModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    skuEsModel.setSkuTitle(string);
                }
                esModels.add(skuEsModel);
            }
        }
        //1、返回所有查询到的商品
        result.setProducts(esModels);
        //2、当前所有商品设计到的所有属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            // 1、得到属性的id
            Long attrId = bucket.getKeyAsNumber().longValue();
            // 2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            // 3、得到属性的所有值
            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = item.getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValue);
            attrVos.add(attrVo);
        }
        result.setAttrs(attrVos);
        //3、当前所有商品的分类信息
        ParsedLongTerms Catalog_agg = response.getAggregations().get("catalog_agg");
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        List<? extends Terms.Bucket> buckets = Catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            // 得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            // 得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //4、当前所有商品的品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            // 1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            // 2、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            // 3、得到品牌的姓名
            String brandname = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandname);
            brandVo.setBrandId(brandId);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //5、分页信息 - 总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //6、分页信息 - 页码
        result.setPageNum(param.getPageNum());
        //7、分页信息 - 总页码
        int totalPages = (int) total % EsConstant.PRODUCT_PAGE_SIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGE_SIZE : ((int) total / EsConstant.PRODUCT_PAGE_SIZE + 1);
        result.setTotalPages(totalPages);

        List<Integer> pageNavs = new ArrayList<>();
        for(int i = 1; i <= totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        return result;
    }

    private SearchRequest buildSearchRequest(SearchParam param) {
        System.out.println(param.toString());

        SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
        //1.查询
        BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
        //1.1查询关键字
        if(StringUtils.isNotEmpty(param.getKeyword())){
            boolQueryBuilder.must(QueryBuilders.matchQuery("skuTitle",param.getKeyword()));
        }
        //1.2filter 过滤查询
        if(param.getCatalog3Id()!=null){
            boolQueryBuilder.filter(QueryBuilders.termQuery("catalogId",param.getCatalog3Id()));
        }
        if(param.getBrandId()!=null&&param.getBrandId().size()>0){
            boolQueryBuilder.filter(QueryBuilders.termsQuery("brandId",param.getBrandId()));
        }

        if(param.getAttrs()!=null&&param.getAttrs().size()>0){
            for(String attrtr:param.getAttrs()){
                BoolQueryBuilder bool = QueryBuilders.boolQuery();
                String[] s = attrtr.split("_");
                String attrId = s[0];
                String[] attrValue = s[1].split(":");
                bool.must(QueryBuilders.termQuery("attrs.attrId",attrId));
                bool.must(QueryBuilders.termsQuery("attrs.attrValue",attrValue));
                NestedQueryBuilder attrs = QueryBuilders.nestedQuery("attrs", bool, ScoreMode.None);
                boolQueryBuilder.filter(attrs);
            }
        }
        if(param.getHasStock()!=null){
            boolQueryBuilder.filter(QueryBuilders.termQuery("hasStock",1==param.getHasStock()?true:false));
        }

        if(StringUtils.isNotEmpty(param.getSkuPrice())){
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            if (s.length==2){
                rangeQuery.gte(s[0]).lte(s[1]);
            }else if (s.length==1) {
                if(param.getSkuPrice().startsWith("_")){
                    rangeQuery.lte(s[0]);
                }
                if(param.getSkuPrice().endsWith("_")){
                    rangeQuery.gte(s[0]);
                }
            }
            boolQueryBuilder.filter(rangeQuery);
        }
        searchSourceBuilder.query(boolQueryBuilder);
        //2排序
        if(StringUtils.isNotEmpty(param.getSort())){
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder sortOrder = s[1].equalsIgnoreCase("asc")?SortOrder.ASC:SortOrder.DESC;
            searchSourceBuilder.sort(s[0],sortOrder);
        }
        //3分页
        searchSourceBuilder.from((param.getPageNum()-1)*EsConstant.PRODUCT_PAGE_SIZE);
        searchSourceBuilder.size(EsConstant.PRODUCT_PAGE_SIZE);

        //4高亮
        if(StringUtils.isNotEmpty(param.getKeyword())){
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle");
            highlightBuilder.preTags("<b style='color:red'>");
            highlightBuilder.postTags("</b>");
            searchSourceBuilder.highlighter(highlightBuilder);
        }
//        System.out.println(request.toString());

        //5聚合分析
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));

        searchSourceBuilder.aggregation(brand_agg);

        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg");
        catalog_agg.field("catalogId").size(10);
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        searchSourceBuilder.aggregation(catalog_agg);

        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");

        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg");
        attr_id_agg.field("attrs.attrId").size(10);

        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(10));
        attr_agg.subAggregation(attr_id_agg);
        searchSourceBuilder.aggregation(attr_agg);

        SearchRequest request = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, searchSourceBuilder);
        System.out.println(searchSourceBuilder.toString());
        return request;
    }
}
